Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests (1)

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A single character of: a, b, c or d
    [[ab][cd]]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Character class intersection
    [\w&&[^\d]]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

"
"
gmi

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"([a-zA-Z0-9_]+)(?=:)"# let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .caseInsensitive]) let testString = #""" [FelixStartLevel] com.adobe.livecycle.content.core-bundle com.adobe.livecycle.content.model.impl.RegisterTypeInternal(3179)] The activate method has thrown an exception (com.adobe.livecycle.content.model.exception.ModelException: ModelException: {Code}-LCC-REP-FCT-002, {Message}-Access denied) com.adobe.livecycle.content.model.exception.ModelException: ModelException: {Code}-LCC-REP-FCT-002, {Message}-Access denied at com.adobe.livecycle.content.repository.utils.ExceptionUtil.getException(ExceptionUtil.java:52) at com.adobe.livecycle.content.repository.utils.ExceptionUtil.getException(ExceptionUtil.java:171) at com.adobe.livecycle.content.model.annotation.persister.AnnotationPersister.persistAnnotations(AnnotationPersister.java:156) at com.adobe.livecycle.content.model.impl.RegisterTypeInternal.registerTypeInternal(RegisterTypeInternal.java:144) at com.adobe.livecycle.content.model.impl.RegisterTypeInternal.registerFileObjectasUnregisteredType(RegisterTypeInternal.java:294) at com.adobe.livecycle.content.model.impl.RegisterTypeInternal.activate(RegisterTypeInternal.java:92) at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.felix.scr.impl.inject.BaseMethod.invokeMethod(BaseMethod.java:224) at org.apache.felix.scr.impl.inject.BaseMethod.access$500(BaseMethod.java:39) at org.apache.felix.scr.impl.inject.BaseMethod$Resolved.invoke(BaseMethod.java:617) at org.apache.felix.scr.impl.inject.BaseMethod.invoke(BaseMethod.java:501) at org.apache.felix.scr.impl.inject.ActivateMethod.invoke(ActivateMethod.java:302) at org.apache.felix.scr.impl.inject.ActivateMethod.invoke(ActivateMethod.java:294) at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:298) at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:109) at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:906) at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:879) at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:823) at org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:347) at org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:247) at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:344) at org.apache.felix.framework.Felix.getService(Felix.java:3699) at org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:470) at org.apache.felix.scr.impl.manager.SingleRefPair.getServiceObject(SingleRefPair.java:72) at org.apache.felix.scr.impl.inject.BindMethod.getServiceObject(BindMethod.java:648) at org.apache.felix.scr.impl.manager.DependencyManager.getServiceObject(DependencyManager.java:2201) at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.prebind(DependencyManager.java:1118) at org.apache.felix.scr.impl.manager.DependencyManager.prebind(DependencyManager.java:1520) at org.apache.felix.scr.impl.manager.AbstractComponentManager.collectDependencies(AbstractComponentManager.java:1006) at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:859) at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:823) at org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:347) at org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:247) at org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:344) at org.apache.felix.framework.Felix.getService(Felix.java:3699 """# let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression